WO1993015384A1 - Einrichtung zur erkennung des klopfens einer brennkraftmaschine - Google Patents
Einrichtung zur erkennung des klopfens einer brennkraftmaschine Download PDFInfo
- Publication number
- WO1993015384A1 WO1993015384A1 PCT/DE1992/001046 DE9201046W WO9315384A1 WO 1993015384 A1 WO1993015384 A1 WO 1993015384A1 DE 9201046 W DE9201046 W DE 9201046W WO 9315384 A1 WO9315384 A1 WO 9315384A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- frequency
- knocking
- filter
- internal combustion
- combustion engine
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L23/00—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid
- G01L23/22—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines
- G01L23/221—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines for detecting or indicating knocks in internal combustion engines
- G01L23/225—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines for detecting or indicating knocks in internal combustion engines circuit arrangements therefor
Definitions
- the invention relates to a device for detecting knocking of an internal combustion engine according to the preamble of the main claim.
- Devices for detecting knocking combustion in internal combustion engines usually have filters to which the output signals of a knock sensor are fed and which filter out the frequency components typical of knocking combustion from these signals. Knocking is then recognized from these frequency components in a subsequent comparison arrangement when the signal components typical for knock are higher than the background signals determined from the entire signal spectrum or the signal spectrum without components typical for knock.
- a device or a method for knock detection which comprises the methods mentioned, is known from DE-OS 33 42 466.
- the output signal of the knock sensor is additionally amplified in a controllable amplifier before filtering so that the signal level is independent of the Speed remains approximately constant.
- the filter is designed as a digital filter, the transfer function of the digital filter being able to be selected as a function of the speed or load by influencing a filter factor k.
- the known device or the known method has the disadvantage that a frequency drift which may occur is not taken into account, which makes reliable knock detection difficult.
- the device according to the invention for detecting knocking of an internal combustion engine with the characterizing features of the main claim has the advantage that the controllable center frequency of the filtering means enables these filtering means to be adapted to the frequency drifts of the knocking signal that occur. This tracking of the center frequency makes it possible to improve the signal-to-noise ratio, which ensures particularly advantageous knock detection.
- Figure 1 a device for knock detection is shown, as is known for example from DE-OS 33 42 466.
- Figures 2 to 4 show three embodiments of the invention.
- a knock sensor 10 for example a structure-borne noise sensor, which supplies the output signals SI, is an amplifier 11, a filter 13 and a rectifier and integrator 14 with the analog / digital converter 16 Computing device 17, for example a microcomputer.
- the amplification of the amplifier 11 can be controlled or regulated, corresponding signals S2, which are supplied by the computing device 17, for example, are supplied via an input 12.
- the filter 13 has a fixed center frequency fm, which is defined in such a way that the signal components caused by knocking are passed, while the signal components are filtered out at other frequencies.
- the rectifier and integrator 14 uses the signal S3 supplied by the filter 13 only during a measurement window and forms a voltage S4 therefrom, which is compared in the computing device 17 after an A / D conversion for knock detection with a background signal, knocking is recognized when the comparison fulfills a predefinable condition.
- Signals S5 which determine the duration of the measurement window and its position in relation to the position of the crankshaft, are supplied via the input 15; these signals S5 are formed in the computing device 17 as a function of the crankshaft position.
- the filter By tracking the center frequency of a selection filter according to the frequency drift (chirp), a significant improvement in the signal-to-noise ratio can be achieved.
- the filter is designed in such a way that it lets through the signals that are characteristic of knocking.
- FIG. 2 shows a first exemplary embodiment of the invention, which has the same elements 10 to 17 as the known device for knock detection according to FIG. 1, which also function in the manner described in connection with FIG Signals interact, in part bear the designations given in FIG. 1.
- the first exemplary embodiment of the invention has a filter
- control signals S6 are fed via an input 25 and which signals S7 to the
- the control signals S6 control the center frequency fml of the filter 18 in a predeterminable range, they are generated in the computing device 17 and are intended to shift the center frequency fml of the filter 18 such that it lies in all working areas of the internal combustion engine in such a way that optimum knock detection is possible or the signal-to-noise ratio is at a maximum.
- the control or shifting of the center frequency fml is carried out with the aid of the computing device 17, which is, for example, a uC, via the clock frequency of a switched capacitor filter, which can be constructed as a coil-less integrable filter.
- This control can be carried out so that the center frequency fml is a function of individual, several or combinations of motor parameters. These parameters are primarily the current crank angle position, the load or the combustion chamber pressure and the speed.
- the signal S8 generated by the rectifier and integrator 19, which is generated by the rectifier and integrator 19, is fed to the computing device 17 and is compared there with a background signal. Knocking is detected when the background signal is exceeded and the computing device 17 initiates suitable measures, for example changing the ignition angle, in order to eliminate the knock. Since the center frequency fml of the filter 18 is controlled by the computing device 17 taking into account the prevailing operating conditions, it is ensured that the signal components of the suitably amplified output signal SI of the knock sensor 10 in the filter 18, which are caused by knocking and are relevant for knock detection, are particularly distinct from those other signal components are separated.
- FIG. 3 shows a further exemplary embodiment of the invention, which comprises a combination of the elements already indicated in FIGS. 1 and 2, the filter 13 with the constant center frequency and the subsequent controlled rectifier and integrator 19 in parallel to the filter 18 with a controlled center frequency and the subsequent controlled rectifier and integrator 19.
- the signal supplied by the knock sensor 10 and amplified in a suitable manner in the amplifier 11 is supplied on the one hand via the filter 18 with a controllable center frequency f 1 and subsequent rectifier and integrator 19 to the computing device 17 and on the other hand via the filter 13 with a constant center frequency fm and the rectifier and integrator 14 are also supplied to the computing device 17.
- the difference between the differently filtered output signals of the knock sensor is formed in the computing device 17 in the point 20 represented as a summation point. If this difference D is above a predeterminable threshold value, knocking is recognized and displayed, or measures are taken by the computing device 17 to eliminate the knocking.
- a plurality of filters 13, 18, 21, 22 are provided which are parallel to one another.
- the filter 13 has a constant center frequency fm, while the filters 18, 21 and 22 have controlled center frequencies fml, fm2, fm3, all of which can be changed within a predefinable range.
- the control of the filters 18, 21, 22 or possibly further filters is triggered by the computing device 17 and is again carried out by coupling control signals S6, S9, S10 via corresponding inputs 25, 27, 28 so that the frequency shifts, if necessary can be done independently.
- the filters 13, 18, 21 and 22 are connected to the computing device 17 via rectifiers and integrators 19, 23, 24 and 25, with an analog / digital converter, generally designated 16, in between.
- the input via which the rectifiers and integrators 19, 23, 24 and 25 are supplied with the control signals denoted by S5 are generally denoted by 15.
- variable center frequencies of the filters 18, 21 and 22 are adapted to the different vibration modes fl, f2, ... fn in the combustion chamber, so that the center frequencies fml, fm2, ... fmn correspond to these frequencies.
- the vibration modes fl, f2, ... fn represent the harmonics of a fundamental vibration f, which is caused by knocking the internal combustion engine.
- the adaptation of the center frequencies is controlled by the computing device 17, for example via the clock frequency one Switched capacitor filter, the trackable center frequencies fml, fm2, ... fmn in turn being dependent on individual, several or combinations of engine operating parameters and these parameters primarily the instantaneous crank angle position, the load or the combustion chamber pressure and the speed are.
- the formation of the measurement window during which the rectifiers and integrators 14, 19, 23 and 24 each work is determined by the computing device 17 as a function of the crankshaft angle or the speed or load.
- the devices shown in FIGS. 2 to 4 can have additional frequency or phase detectors which determine the frequency and phase of the sensor output signals.
- the sensor output signal processed in the amplifier 11 is decoupled and fed to the frequency or phase detector 30.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Measuring Fluid Pressure (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP51283893A JP3335628B2 (ja) | 1992-01-22 | 1992-12-15 | 内燃機関のノッキング検出装置 |
EP93901587A EP0576650B1 (de) | 1992-01-22 | 1992-12-15 | Einrichtung zur erkennung des klopfens einer brennkraftmaschine |
BR9205565A BR9205565A (pt) | 1992-01-22 | 1992-12-15 | Equipamentos para a identificaçao da batida de um motor de combustao interna |
DE59208553T DE59208553D1 (de) | 1992-01-22 | 1992-12-15 | Einrichtung zur erkennung des klopfens einer brennkraftmaschine |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4201567A DE4201567A1 (de) | 1992-01-22 | 1992-01-22 | Einrichtung zur erkennung des klopfens einer brennkraftmaschine |
DEP4201567.7 | 1992-01-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1993015384A1 true WO1993015384A1 (de) | 1993-08-05 |
Family
ID=6449977
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE1992/001046 WO1993015384A1 (de) | 1992-01-22 | 1992-12-15 | Einrichtung zur erkennung des klopfens einer brennkraftmaschine |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0576650B1 (de) |
JP (1) | JP3335628B2 (de) |
BR (1) | BR9205565A (de) |
DE (2) | DE4201567A1 (de) |
ES (1) | ES2102005T3 (de) |
WO (1) | WO1993015384A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7334568B2 (en) | 2005-09-20 | 2008-02-26 | Toyota Jidosha Kabushiki Kaisha | Knock control apparatus for an internal combustion engine and control method thereof |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4408243B4 (de) * | 1994-03-11 | 2007-06-21 | Robert Bosch Gmbh | Einrichtung zur Erfassung einer pulsierenden Größe |
JP3799618B2 (ja) * | 1994-10-21 | 2006-07-19 | 株式会社デンソー | 信号処理回路 |
JP3696002B2 (ja) * | 1999-09-20 | 2005-09-14 | 三菱電機株式会社 | 内燃機関のノック制御装置 |
DE50107442D1 (de) | 2000-08-11 | 2005-10-20 | Bosch Gmbh Robert | Klopferkennung bei brennkraftmaschinen mit modifizierung bei änderung einer filtercharakteristik oder zylinderindividueller änderung |
DE10135674A1 (de) * | 2001-07-21 | 2003-02-06 | Brueel & Kjaer Vibro Gmbh | Verfahren und Vorrichtung zur Auswertung von Meßsignalen |
DE10141727A1 (de) * | 2001-08-25 | 2003-03-06 | Brueel & Kjaer Vibro Gmbh | Anti-Alias-Tiefpass mit nachfolgender Integration |
JP2006161649A (ja) | 2004-12-06 | 2006-06-22 | Denso Corp | ノック検出装置 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4466406A (en) * | 1980-07-10 | 1984-08-21 | Robert Bosch Gmbh | Regulating device for control variables of an internal combustion engine |
US4651698A (en) * | 1986-04-14 | 1987-03-24 | General Motors Corporation | Adaptive knock control with pulse duration discrimination control |
EP0423031A1 (de) * | 1989-10-11 | 1991-04-17 | Marelli Autronica | Verfahren und Einrichtung zum Ermitteln des Klopfens |
-
1992
- 1992-01-22 DE DE4201567A patent/DE4201567A1/de not_active Withdrawn
- 1992-12-15 BR BR9205565A patent/BR9205565A/pt active IP Right Grant
- 1992-12-15 EP EP93901587A patent/EP0576650B1/de not_active Expired - Lifetime
- 1992-12-15 DE DE59208553T patent/DE59208553D1/de not_active Expired - Lifetime
- 1992-12-15 JP JP51283893A patent/JP3335628B2/ja not_active Expired - Lifetime
- 1992-12-15 WO PCT/DE1992/001046 patent/WO1993015384A1/de active IP Right Grant
- 1992-12-15 ES ES93901587T patent/ES2102005T3/es not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4466406A (en) * | 1980-07-10 | 1984-08-21 | Robert Bosch Gmbh | Regulating device for control variables of an internal combustion engine |
US4651698A (en) * | 1986-04-14 | 1987-03-24 | General Motors Corporation | Adaptive knock control with pulse duration discrimination control |
EP0423031A1 (de) * | 1989-10-11 | 1991-04-17 | Marelli Autronica | Verfahren und Einrichtung zum Ermitteln des Klopfens |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7334568B2 (en) | 2005-09-20 | 2008-02-26 | Toyota Jidosha Kabushiki Kaisha | Knock control apparatus for an internal combustion engine and control method thereof |
Also Published As
Publication number | Publication date |
---|---|
JPH06505805A (ja) | 1994-06-30 |
EP0576650B1 (de) | 1997-05-28 |
BR9205565A (pt) | 1994-04-26 |
JP3335628B2 (ja) | 2002-10-21 |
DE4201567A1 (de) | 1993-07-29 |
ES2102005T3 (es) | 1997-07-16 |
DE59208553D1 (de) | 1997-07-03 |
EP0576650A1 (de) | 1994-01-05 |
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